Get Advances in Supramolecular Chemistry, Volume 4 (Advances in PDF

By G.W. Gokel

ISBN-10: 0080550894

ISBN-13: 9780080550893

ISBN-10: 1559387947

ISBN-13: 9781559387941

A part of a chain which provides experiences of efforts in all parts of supramolecular technological know-how, this quantity discusses numerous subject matters within the box.

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Extra resources for Advances in Supramolecular Chemistry, Volume 4 (Advances in Supramolecular Chemistry)

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Here lies the advantage of the supramolecular design. Like tris(2,2'bipyridyl) Ru(II), many lumophores show electroswitchable luminescence. An 24 A. PRASANNA DE SILVA ETAL. u(ll) 56 55 all-organic example would be anthracene whose bright blue emission would be lost upon generation of the radical anion in aprotic medium. g. 154 Overall, it appears that lumophore-spacer-receptor systems with redox active guests have many treats in store for chemists of widely differing backgrounds. 7. ORTHOGONAL LUMOPHORE-RECEPTOR SYSTEMS Another important strategy that has been introduced into luminescent PET devices is the idea of virtual spacers in lumophore-spacer-receptor systems.

Nevertheless, lumophore-spacer-receptor systems which show guest ion-induced on-off switching of luminescence are severely underrepresented in the literature compared to their off-on cousins. There may be several reasons for thispaucity, but the most important of these appears to have its origin in analytical chemistry. It is well appreciated that a fluorescent reagent will have a lower limit of detection for a given analyte if the analyte causes fluorescent enhancement rather than quenching, z26 It appears that designers of luminescent devices have been inhibited from researching on-off switchable systems due to this influence.

This is well above the limit of detection of the analyte by fluorescence methods. Furthermore, the analyte concentration range to which the switchable luminescent device is sensitive would be controlled by the binding constant and this would usually not be limited by the luminescent properties. Another reason why device designers have shied away from luminescent systems which are switched "off" by guest ions is the fear of nonspecific quenching. Again, this fear is more apparent than real in many situations.

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Advances in Supramolecular Chemistry, Volume 4 (Advances in Supramolecular Chemistry) by G.W. Gokel


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